Method of producing polyurethane-based cores and moulds according to the so-called cold-box procedure
US3933727A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1973 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | Sep 13, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6674
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is provided for producing polyurethane-based cores and moulds, using a mixture of particle-formed material such as sand, a bonding agent containing a polyisocyanate compund and a polyhydroxy compound and if necessary a solvent, after which the mixture is shaped to a desired form and hardened by means of a catalyst, wherein the polyhydroxyl compound consists of one or more aliphatic or aromatic polyethers, together with a hydroxyl compound for initiating the catalyzation, which hydroxy compound consists of an aromatic compound with at least two OH groups which directly, or via a methalene group, are linked to a carbon atom in the aromatic nucleus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.